As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FROM KTOL TO CYJT, CREW NOTICED THE HYDRAULIC PRESSURE DROPPED TO 2000 POUNDS OF PRESSURE. THE CREW ELECTED TO RETURN TO KTOL AND SAFELY LANDED. MAINTENANCE REPLACED THE HYDRAULIC PRESSURE TRANSMITTER. THE HYDRAULIC SYSTEM OPERATIONAL CHECK WAS GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.